In simple terms, the phrase "bridge fuel" refers to an energy source that is used temporarily to transition from one form of energy to another. It acts as a temporary bridge until a more sustainable and permanent energy solution can be developed.
Sentences with «bridge fuel»
The next thing automakers did was to bridge the fuel economy gap by offering more gears. (bestride.com)
To put a nail in natural gas as bridge fuel away from coal, here's Myhrvold on the effect of rapidly replacing coal with natural gas on temperatures over the next 100 years: (treehugger.com)
Gas is a very good bridging fuel to get there as it has less than half of the emissions, for instance, that coal has and also much less than oil has. (publications.parliament.uk)